Thermally-released check-valve.



A. `=-.7,7. GARLSGN. THERMALLY RELEASED CHECK VALVE. APPLICATION FILEDMAR,22,1913,

Paten Deo. 23, IQES.

mi. w. caarson, or mmarmroms, mmsorn.

THERMALLY-RELEASED CHECK-VALVE.

I speei'canon or Leners raient.

Patented Dec. 23, 1913.

Application le March 22, 1913, Serial No. 756,171.

To all whom t may concern: I

Be it known that I, lAXEL W. CARLsoN, a citizen" of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inThermally- Released Check-Valves; and l do hereby de- ,clare thefollowing to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention has for its object to provide a safety device forautomatically cutting od the supply of gas or gasolene from storagetanks, service pipes, and the like, in case of re or when thetemperature in a room has risen to a predetermined degree.

. To the above ends, generally stated, the invention consists of thenovel devices and combinations of devices hereinafter described anddefined in the claim.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a view in side elevation, showingmy invention; Fig. 2 is a plan view of the same; and Fig. 3 is a viewpartly in side elevation and partly in longitudinal section, taken onthe line w3 m3 of Fig. 2.

The numeral 1 indicates a gas supply pipe or conduit having interposedtherein a valve casing 2. Within the valve casing 2 is a transversepartition 2 having formed therein a port 3, which aifords communicationthrough the valve casing 2. The port 3 is adapted to be closed by acheck valve 4, having a valve stem 5. One end of this valve stem 5 worksthrough a stuing box 6 on the valve casing 2, and the vother end thereofis seated, for endwise sliding movement, in an internal seat 7, formedin a screw plug 8, which normally closes an opening in the valve casing2, provided for inserting the valve 4 therein and removing said valvetherefrom. A coiled vspring 9 is mounted on the valve stem .5, iscompressed between the valve 4 and screw plug 8 and tends to yieldinglyhold said valve in a position to close the port 3 in the partition 2,thereby cutting olf communication through the valve casing 2.

The parts thus far described may be of the standard or any desiredconstruction.

. Suitable means, including a fusible element, is provided for normallyholdin the valve 4 open, against the tension o the spring 9, to permitfree passage of gas through the valve casing 2. This lock comprises ayoke 10, having its transverse portion perforated and telescoped ontothe hub of the stuiiing box 6. A set nut 11 having screw threadedengagement with the hub of the stuiiing box 6 is provided for clampingthe intermediate portion of the yoke 10 onto the valve casing 2. One ofthe prongs of the yoke 1() is bent to form a hook 12, and the otherprong thereof is bent laterally outward, to aord an extension 13.

r Extending transversely across the path of movement of the outwardlyprojecting end of the valve stem 5 and connected to the prongs of theyoke 10 is a lever 14. One end of the lever 14 is provided with a hook15, which has interlocking engagement with the hook 12 of the yoke 10,to afford a fulcrum for the lever 14. The other or free end of the lever14 is secured to the yoke extension 13 by fusible solder 16. In securingthe lever 14 to the prongs of the yoke 10, it is necessary to force thevalve stem 5 inward,

thereby moving the valve 4 out of engagement with the port 3 against thetension of the spring 9.

, The valve 4 is normally held in an open osition by the lever 14 untilthe solder 16 uses under the required temperature. The fusing of thesolder 16 releases the lever 14 from the yoke extension 13, and theaction of the compressed spring 8 on the valve stem 5 swings the lever14 outward on its fulcrum, thereby permitting the valve 4 to seat andclose the port 3, thus cutting off the ysupply of gas.v

The above described device, in actual usage, has been found highlyefficient for the purpose had in view.

What 1 claim is: The combination with a conduit, of a valve c asinginterposed in said conduit, Ya stuffing box on said casing,'a valve insaid conduit having a stem Working through said stuiing box, a springtending to close said valve, a yoke having its transverse portionsecuredto the hub of said stufing box, one of the prongs 5 of said yoke havinga hook and the other prong thereof beingbent laterally, and a leverhaving, at one end, ahook separably fulcrumed on the hook of said yokeand having its other end secured, by fusible solder,

10 to the laterally bent portion of said` prong,

the intermediate portion of said lever having engagement with said valvestem to normally hold said valve open.

In testimony whereof I ax my signature in presence of tvvo Witnesses.

AXEL W. CARLSGN.,

Witnesses:

HARRY D. Knieonn, F. D. MERCHANT. y

